Bhagavatapurana 4.7.17

4.7.17

vaiṣṇavaṃ yajña-santatyai tri-kapālaṃ dvijottamāḥ /
puroḍāśaṃ niravapan vīra-saṃsarga-śuddhaye //

17. (O Warrior), the great Brāhmins poured an offering of three plates dedicated to Vishnu, to secure the continuity of the sacrifice and to remove (the pollution resulting from) the touch of the Pramathas and other Bhūtas that fought there.